{"id":"CVE-2022-50045","summary":"powerpc/pci: Fix get_phb_number() locking","details":"In the Linux kernel, the following vulnerability has been resolved:\n\npowerpc/pci: Fix get_phb_number() locking\n\nThe recent change to get_phb_number() causes a DEBUG_ATOMIC_SLEEP\nwarning on some systems:\n\n  BUG: sleeping function called from invalid context at kernel/locking/mutex.c:580\n  in_atomic(): 1, irqs_disabled(): 0, non_block: 0, pid: 1, name: swapper\n  preempt_count: 1, expected: 0\n  RCU nest depth: 0, expected: 0\n  1 lock held by swapper/1:\n   #0: c157efb0 (hose_spinlock){+.+.}-{2:2}, at: pcibios_alloc_controller+0x64/0x220\n  Preemption disabled at:\n  [\u003c00000000\u003e] 0x0\n  CPU: 0 PID: 1 Comm: swapper Not tainted 5.19.0-yocto-standard+ #1\n  Call Trace:\n  [d101dc90] [c073b264] dump_stack_lvl+0x50/0x8c (unreliable)\n  [d101dcb0] [c0093b70] __might_resched+0x258/0x2a8\n  [d101dcd0] [c0d3e634] __mutex_lock+0x6c/0x6ec\n  [d101dd50] [c0a84174] of_alias_get_id+0x50/0xf4\n  [d101dd80] [c002ec78] pcibios_alloc_controller+0x1b8/0x220\n  [d101ddd0] [c140c9dc] pmac_pci_init+0x198/0x784\n  [d101de50] [c140852c] discover_phbs+0x30/0x4c\n  [d101de60] [c0007fd4] do_one_initcall+0x94/0x344\n  [d101ded0] [c1403b40] kernel_init_freeable+0x1a8/0x22c\n  [d101df10] [c00086e0] kernel_init+0x34/0x160\n  [d101df30] [c001b334] ret_from_kernel_thread+0x5c/0x64\n\nThis is because pcibios_alloc_controller() holds hose_spinlock but\nof_alias_get_id() takes of_mutex which can sleep.\n\nThe hose_spinlock protects the phb_bitmap, and also the hose_list, but\nit doesn't need to be held while get_phb_number() calls the OF routines,\nbecause those are only looking up information in the device tree.\n\nSo fix it by having get_phb_number() take the hose_spinlock itself, only\nwhere required, and then dropping the lock before returning.\npcibios_alloc_controller() then needs to take the lock again before the\nlist_add() but that's safe, the order of the list is not important.","modified":"2026-11-07T02:30:44.436479636Z","published":"2025-06-18T11:01:46.233Z","related":["SUSE-SU-2025:02264-1","SUSE-SU-2025:02308-1","SUSE-SU-2025:02320-1","SUSE-SU-2025:02321-1","SUSE-SU-2025:02322-1","SUSE-SU-2025:02334-1","SUSE-SU-2025:02537-1"],"database_specific":{"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2022/50xxx/CVE-2022-50045.json","cna_assigner":"Linux"},"references":[{"type":"WEB","url":"https://git.kernel.org/stable/c/1d9e75c3d8cdf7c96a94cb77450d4ee070279e6a"},{"type":"WEB","url":"https://git.kernel.org/stable/c/5db5ce0f1963c6c8275719a80cb65e9c98d32726"},{"type":"WEB","url":"https://git.kernel.org/stable/c/6f75057c21eab12c6ccb7f06f859641a6edfab99"},{"type":"WEB","url":"https://git.kernel.org/stable/c/8d48562a2729742f767b0fdd994d6b2a56a49c63"},{"type":"WEB","url":"https://git.kernel.org/stable/c/90f195c01a2e8d8da6281791617e21109719c981"},{"type":"WEB","url":"https://git.kernel.org/stable/c/a868f771ee41c97a25a04b8c632a7f06689b307b"},{"type":"WEB","url":"https://git.kernel.org/stable/c/ccb0a42d3f40c436295e0fef57ab613ae5b925a4"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2022/50xxx/CVE-2022-50045.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2022-50045"},{"type":"PACKAGE","url":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"a79e4395619c926ea7e828b2023c0fbe2776385b"},{"fixed":"6f75057c21eab12c6ccb7f06f859641a6edfab99"}]},{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"205826dcac3271ab04fb97d66f1b4f8219723259"},{"fixed":"5db5ce0f1963c6c8275719a80cb65e9c98d32726"}]},{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"3ec50b8a0128359ff4ad4061a75c3322d0ab6ac9"},{"fixed":"ccb0a42d3f40c436295e0fef57ab613ae5b925a4"}]},{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"47a8fe1b154aa6d836582365b1c70684af8597e4"},{"fixed":"a868f771ee41c97a25a04b8c632a7f06689b307b"}]},{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"ef0f4eeaba2463a77ac5a4e42c30717deb3c7b62"},{"fixed":"1d9e75c3d8cdf7c96a94cb77450d4ee070279e6a"}]},{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"f35c7f506fb96a23a1961c7314c5931ec8bc473e"},{"fixed":"90f195c01a2e8d8da6281791617e21109719c981"}]},{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"0fe1e96fef0a5c53b4c0d1500d356f3906000f81"},{"fixed":"8d48562a2729742f767b0fdd994d6b2a56a49c63"}]},{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"5.18.18"},{"fixed":"5.19"}]},{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"e0274da3ac318296fed503422ccda98ce67e99cb"}]}],"versions":["v5.10.137","v5.15.62","v5.15.61","v5.19.3","v5.19.2","v5.18.19","v5.18.18"],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2022-50045.json"}},{"package":{"name":"Kernel","ecosystem":"Linux"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"5.10.137"},{"fixed":"5.10.138"}]},{"type":"ECOSYSTEM","events":[{"introduced":"5.15.61"},{"fixed":"5.15.63"}]},{"type":"ECOSYSTEM","events":[{"introduced":"5.19.2"},{"fixed":"5.19.4"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2022-50045.json"}}],"schema_version":"1.9.2"}